mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 23:46:42 +07:00
27c4d548af
This patch fixes an unused label warning triggered when the macro
XOR_SELECT_TEMPLATE is not set.
Fixes: 39457acda9
("crypto: xor - skip speed test if the xor...")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Suggested-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
169 lines
4.0 KiB
C
169 lines
4.0 KiB
C
/*
|
|
* xor.c : Multiple Devices driver for Linux
|
|
*
|
|
* Copyright (C) 1996, 1997, 1998, 1999, 2000,
|
|
* Ingo Molnar, Matti Aarnio, Jakub Jelinek, Richard Henderson.
|
|
*
|
|
* Dispatch optimized RAID-5 checksumming functions.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
|
* any later version.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* (for example /usr/src/linux/COPYING); if not, write to the Free
|
|
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#define BH_TRACE 0
|
|
#include <linux/module.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/raid/xor.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/preempt.h>
|
|
#include <asm/xor.h>
|
|
|
|
#ifndef XOR_SELECT_TEMPLATE
|
|
#define XOR_SELECT_TEMPLATE(x) (x)
|
|
#endif
|
|
|
|
/* The xor routines to use. */
|
|
static struct xor_block_template *active_template;
|
|
|
|
void
|
|
xor_blocks(unsigned int src_count, unsigned int bytes, void *dest, void **srcs)
|
|
{
|
|
unsigned long *p1, *p2, *p3, *p4;
|
|
|
|
p1 = (unsigned long *) srcs[0];
|
|
if (src_count == 1) {
|
|
active_template->do_2(bytes, dest, p1);
|
|
return;
|
|
}
|
|
|
|
p2 = (unsigned long *) srcs[1];
|
|
if (src_count == 2) {
|
|
active_template->do_3(bytes, dest, p1, p2);
|
|
return;
|
|
}
|
|
|
|
p3 = (unsigned long *) srcs[2];
|
|
if (src_count == 3) {
|
|
active_template->do_4(bytes, dest, p1, p2, p3);
|
|
return;
|
|
}
|
|
|
|
p4 = (unsigned long *) srcs[3];
|
|
active_template->do_5(bytes, dest, p1, p2, p3, p4);
|
|
}
|
|
EXPORT_SYMBOL(xor_blocks);
|
|
|
|
/* Set of all registered templates. */
|
|
static struct xor_block_template *__initdata template_list;
|
|
|
|
#define BENCH_SIZE (PAGE_SIZE)
|
|
|
|
static void __init
|
|
do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2)
|
|
{
|
|
int speed;
|
|
unsigned long now, j;
|
|
int i, count, max;
|
|
|
|
tmpl->next = template_list;
|
|
template_list = tmpl;
|
|
|
|
preempt_disable();
|
|
|
|
/*
|
|
* Count the number of XORs done during a whole jiffy, and use
|
|
* this to calculate the speed of checksumming. We use a 2-page
|
|
* allocation to have guaranteed color L1-cache layout.
|
|
*/
|
|
max = 0;
|
|
for (i = 0; i < 5; i++) {
|
|
j = jiffies;
|
|
count = 0;
|
|
while ((now = jiffies) == j)
|
|
cpu_relax();
|
|
while (time_before(jiffies, now + 1)) {
|
|
mb(); /* prevent loop optimzation */
|
|
tmpl->do_2(BENCH_SIZE, b1, b2);
|
|
mb();
|
|
count++;
|
|
mb();
|
|
}
|
|
if (count > max)
|
|
max = count;
|
|
}
|
|
|
|
preempt_enable();
|
|
|
|
speed = max * (HZ * BENCH_SIZE / 1024);
|
|
tmpl->speed = speed;
|
|
|
|
printk(KERN_INFO " %-10s: %5d.%03d MB/sec\n", tmpl->name,
|
|
speed / 1000, speed % 1000);
|
|
}
|
|
|
|
static int __init
|
|
calibrate_xor_blocks(void)
|
|
{
|
|
void *b1, *b2;
|
|
struct xor_block_template *f, *fastest;
|
|
|
|
fastest = XOR_SELECT_TEMPLATE(NULL);
|
|
|
|
if (fastest) {
|
|
printk(KERN_INFO "xor: automatically using best "
|
|
"checksumming function %-10s\n",
|
|
fastest->name);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Note: Since the memory is not actually used for _anything_ but to
|
|
* test the XOR speed, we don't really want kmemcheck to warn about
|
|
* reading uninitialized bytes here.
|
|
*/
|
|
b1 = (void *) __get_free_pages(GFP_KERNEL | __GFP_NOTRACK, 2);
|
|
if (!b1) {
|
|
printk(KERN_WARNING "xor: Yikes! No memory available.\n");
|
|
return -ENOMEM;
|
|
}
|
|
b2 = b1 + 2*PAGE_SIZE + BENCH_SIZE;
|
|
|
|
/*
|
|
* If this arch/cpu has a short-circuited selection, don't loop through
|
|
* all the possible functions, just test the best one
|
|
*/
|
|
|
|
#define xor_speed(templ) do_xor_speed((templ), b1, b2)
|
|
|
|
printk(KERN_INFO "xor: measuring software checksum speed\n");
|
|
XOR_TRY_TEMPLATES;
|
|
fastest = template_list;
|
|
for (f = fastest; f; f = f->next)
|
|
if (f->speed > fastest->speed)
|
|
fastest = f;
|
|
|
|
printk(KERN_INFO "xor: using function: %s (%d.%03d MB/sec)\n",
|
|
fastest->name, fastest->speed / 1000, fastest->speed % 1000);
|
|
|
|
#undef xor_speed
|
|
|
|
free_pages((unsigned long)b1, 2);
|
|
out:
|
|
active_template = fastest;
|
|
return 0;
|
|
}
|
|
|
|
static __exit void xor_exit(void) { }
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/* when built-in xor.o must initialize before drivers/md/md.o */
|
|
core_initcall(calibrate_xor_blocks);
|
|
module_exit(xor_exit);
|